Knife sharpener



Feb. 5, 1,935;

H. J. EDLUND l KNIFE SHARPENER Filed Jan. 26, 1934 WITNESS INVENTOR EJEdluncl,

7 BY M i% v fiil# fi TTORNEYS turnedsperipheral fiangcsrand being vmountedaon' Patented Feb. 5, 1935 UENHT ED S TATZEiS 'QFFEC E 1,990,117 KNIFE. sHARPENER 1 "Henry J.Edluni Burlington, Application ranuan czc, 1934, Serial e. 708,457

rolai s. (o1. -7c, s7)

"This ."invention relates to knife ,sharpeners.

. :An. object of the invention-11s :the :provision of asknife sharpenerwwlich includes .a pair .of: rotaable .imembers disposed in juxtaposition and mounted :.on:shafts, :the inner ends of :the :shafts being :directed towards each otherrtat ran angle to a vertical plane passing through 'rthefadjacent ends of the shaftssothatzthe rotatable :members will :have :their'rperipheral cutting GdgBSofi-t one side of the shafts "in closer relationship than similarly ZdiSDQSQd "peripheral .:portions lof':ithe;.-ro- :tatable members :at the-other side of the: shafts wherebyatherknifezedge will only engage l the zfirstmentioned peripheral :portions of the Erotatable I members.

. Another obj ectzcf :theinvention is the provision of :a knife sharpener. having'zco'ncavely rformed ,rotatablecmcmbers :located at anrzacute angle :to each other, the ;rotatable--,:m'embers havin zinshaftsiwhichzare.;.located :atuanangle to ;a vertical plane passing through supports of said shafts whereby the peripheral :po'rtions @of' the rotatable members adjacent the apexzcf the-zanglez-fcrmed between the cup-shapedrotatable members will .beain qcloserzassociation at one 551K216 ofathevertieal plane :than the opposite peripheral :portions on the cother :side of the ivertical plane :so that the d f:th61kl'fif wi'llmake contactonlyiwithrthe first-.mentionedperipheral portionsto:causerota- .tionzof the rotatable members.

.A further -.object bf the invention ;is the proe vision-ofra knife ssharpener [which "includes-rotatable members .having an annularknife edge-at their per lpheral portions locatefdiat :an sangleuto the vertical passing through :said members so .thatacertaimportions :of .,-:sai-d :membe-rs -will .abe zin close association to provide :a' wedge-shaped ecu-tting action between the rotatablegmembers'ithe cup-shaped members being securicdrnncshaftszand mounted in bearings on a base member, said rotatable members having central concave portions facing each other for guiding the edge of a knife onto the closely associated peripheral portions of the rotatable members, the shafts'being disposed at such angles with respect to the horizontal plane and the vertical plane that only two adjacent points of the rotatable members will be in contact with the edge of the knife at any time.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawing forming a part of the specification; nevertheless, it is to be understood that the invention is not confinedzto the disclosure, being susceptible of such changesaand modifications as define no material departure from the salient features of the invention as expressed :in :In the. drawing:

the appended claims.

" .Figureilisa sidetviewtof a knife sharpener constructed .in; accordance with the principles of my invention,

--Figure 2 is :a plan view of the-same, H Figure 3 .is a vertical section taken along-the line r- 3,-3 -of Figure '1, and 1 I t Figure 4 is averticalseotiontaken alongthe line 4-.4 0f Figure 2.

Referring more particularly to the drawing,

designates -a support for the knife sharpener a which; consists. of a-pair; of L-shaped metal members'l liand l2. I ..Each.of.the members has atbase portion :13 .anda vertical 3'DOI'tlOI1. 14:. The verticalrmembersor walls .14. are securedtogetherin any+approved mannerrand .rivets .15 and .16 .are

illustrated as showing one .form of means.

.Portionsl'l of .the .vertically disposed walls .are

offset. and .semiecircular ...members are, formed at the upper ,ends ,of .these :ofiset members to pro- 'jvide bearings .18 ,and 1 9.

shown.morelparticularly in Fig, 2, aredisposed at an angle to a vertical plane passing through the contactingfaces ofthe vertical walls 14. It will be noted that the bearing 18 is inclined at a greater angle to the'vertical planethan the-axis of the bearing19 fora purpose which will be presently explained.

"It-will also be noted that these bearings are located at an acute angle'to -a horizontal with theibearing 518.

. the bearing 19 disposed. at agreater angle than shaft.

A shaft 20 disposed in the bearing 19 and disclosed in dotted lines is also provided with a swaged-over portion 24.

The shaft 20 has a shoulder constructed similarly to the shoulder 22 on the shaft 20 and a concave member 26 is clamped between the shoulder and the swaged portion 24. An annular inturned flange 25 is formed integrally with the concave member 26 These bearings, as

while an inturned annular flange 2'7 is formed on the member 21.

The periphery of the member 21 is provided with an inclined cutting edge 30 for aiding in sharpening a knife as will be presently explained. The peripheral portion 31 of the member 26 is similarly formed. From this construction it will be seen that the concave members which are secured to their respective shafts 20 and 20 and mounted in their respective bearings 18 and 19 are, therefore, rotatable. A handle 32 is secured in any approved manner to an extension 33 of the bearing 19.

The operation of my device is as follows: It is important to note that the bearings 18 and 19 are not only disposed in different angular relationship with respect to a vertical plane passing through the contacting surfaces of the vertical walls 14 but they are disposed in a different angular arrangement with respect to a horizontal passing through the securing means or rivets 16. By this arrangement the flange portion 25 of the member 26 is nested slightly within the flange portion 27 of the concave member 21.

The portions of the peripheries of the rotatable members when they reach the point indicated at 35 are at a higher horizontal level than the opposite adjacent points 36. By this arrangement the cutting edge of a knife when placed in a horizontal position will only engage the points 35 so that the discs will be rotated and a uniform sharpening of the knife edge will be had, while the members 21 and 26 will be revolved during the operation.

The concave members 21 and 26 will readily guide the knife edge to the contacting points 35. While the concave members are made of hard steel, said members will not injure the knife edge when the knife edge comes'in contact with one of these surfaces for guiding it into the cutting portions of the members 21 and 26. Only a gentle pressure is necessary to produce a cutting edge on the instrument drawn through the sharpener. The members 21 and 26 will always be rotated due to the fact that the contacting points between the knife and the rotatable members are below the axis of the cup-shaped member.

It will also be noted by the particular construction of the loosely mounted shafts 20 and 20 in the respective bearings 18 and 19 that the rotatable cutters may be moved towards or away from each other with the outward movement being limited by the inner ends of the bearings 18 and 19. The peripheral portions 30 and 31 respectively of the rotatable members 21 and 26 are ground, leaving a very sharp edge.

While I have described the cutters made of hardened steel, it will be appreciated that these members may be formed of emery or other suitable cutting material.

What I claim is:

1. A blade sharpener comprising a base member, bearings supported by the base member, shafts mounted in the bearings, rollers having their peripheries adjacent each other and provided with cutting edges for supporting the edge of a blade in operative relation with said cutting edges of the rollers, the rollers being arranged at an angle to each other so that the edge of the blade will be in contact with asingle point on each roller at one side of the shafts, the rollers having concave portions acting as guides for directing the blade on to the cutting edges of the rollers.

2. A blade sharpener comprising a base member, rollers mounted for rotation on the base member and provided with peripheral cutting edges, the rollers having inturned flanges, the flanges of one roller having a portion disposed within a portion of the flange of the other roller so that the peripheral cutting edges will be moving in crossing relationship when the rollers are revolved, the initial crossing points at one side of the centers of the rollers being at a greater distance from the base member than the initial crossing points of the cutting edges at the other side of the centers.

3. A blade sharpener comprising a base member, a pair of cutting rollers mounted for rotation on the base member and disposed at an angle to each other with the lower portion of one roller being at a higher level than the other roller, one of the rollers having an annular lateral extension provided with a cutting edge, the other roller having an annular cutting edge with a portion thereof being nested within the lateral flange of the other roller crossing each other at a point which is common to both cutting edges so that when a knife edge is drawn over a common point the rollers will be revolved to bring other common points into shearing action with the knife edge.

4. A blade sharpener comprising a base member, a pair of cutting rollers mounted for rotation on said base member and disposed at an angle to each other, said rollers having a flange projecting toward each other, the lower portion of a flange of one roller being nested in the lower portion of a flange of the other roller, the flange of each roller having a peripheral cutting edge, the cutting edges crossing each other in a common point'at each side of the centers of the rollers, the common point of crossing at one side of the centers being at a greater height from the base member than the common point of crossing at the other side so that a knife edge will engage but one common point and will cause the rollers to revolve and present successive common points to the knife edge when the knife edge is drawn over said points.

H. J. EDLUND. 

